Income Taxes - Summary of Components of Income Before Income Tax (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income before income taxes:
United States	$ 424	$ 511	$ 300
International	6	5	1
Income before income taxes	$ 430	$ 516	$ 301

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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+ Details